A couple of ideas.
1. If you want to take advantage of the larger partition size available with Win98, you might also want to partition first. Win95 had that 2 gig limit. This way you could use your entire drive as one partition. Not saying you should do this but it is a possibility.
2. If there is any data you want to keep, and don't care about the partition size, you don't necessarily need to reformat to effectively have a clean install. Just boot to DOS and rename or delete the current Windows and Program Files directory. Then install like you normally would.
3. In all cases, it might be a good idea to backup any critical data or configurations first.
1. If you want to take advantage of the larger partition size available with Win98, you might also want to partition first. Win95 had that 2 gig limit. This way you could use your entire drive as one partition. Not saying you should do this but it is a possibility.
2. If there is any data you want to keep, and don't care about the partition size, you don't necessarily need to reformat to effectively have a clean install. Just boot to DOS and rename or delete the current Windows and Program Files directory. Then install like you normally would.
3. In all cases, it might be a good idea to backup any critical data or configurations first.
